| 摘要 |
A method of making optical fibers that includes controlled cooling to produce fibers having a low concentration of non-bridging oxygen defects and low sensitivity to hydrogen. The method may include heating a fiber preform above its softening point, drawing a fiber from the heated preform and passing the fiber through two treatment stages. The fiber may enter the first treatment stage at a temperature between 1500 ºC and 1700 ºC, may exit the first treatment stage at a temperature between 1200 ºC and 1400 ºC, and may experience a cooling rate less than 5000 ºC/s in the first treatment stage. The fiber may enter the second treatment stage downstream from the first treatment stage at a temperature between 1200 ºC and 1400 ºC, may exit the second treatment stage at a temperature between 1000 ºC and 1150 ºC, and may experience a cooling rate between 5000 ºC/s and 12,000 ºC/s in the second treatment stage. The method may also include redirecting the fiber with a fluid bearing device or an air-turn device. |
